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Plzz can anyone explain me the activity 13.9 in NCERT text science in chapter.... Magnetic effects of electric current.

Please refer to the answer given by shreyada. 

See, the basic idea behind this is to demonstrate the principle of electromagnetic induction. When there is a change in magnetic field , a current is induced in the coil. That is, a changing magnetic field can produce a current. 

Now, when you switch on the key current starts flowing in coil 1. So, the value of current increases from 0 to certain value I. We know, that current carrying wire produces a magnetic field. Since the current is increasing, the magnetic field is also increasing. This changing magnetic field induces a current in coil 2 and thus, the galvanometer shows a deflection. 

@ shreyada: good job! keep posting!

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simple .. take a paper roll  and  around it wrap  2  coils , keep some dist. between 'em  also take one coil half  the other ( i.e  say u hav 10 turns in one coil  tak the other as 5 turns ) , mark 1 as c1 and other as c2  , now connect c1 with the terminals of a battery  and a plug key with galvanometer  ( is an instrument used to detect the presence of current ) . Now pass the current i.e. plug in the key  in c1 . u shall  observe that there is a deflection of the needle of galvanometer . hence this activity proves that  a changing  magnetic field in a conductor induces current in another conductor .

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How there is a change in magnetic field..?

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